I had a user bring in a box from home they were having issues with, and wondered if I would take a look. The main problem was that their Network Adapter settings window was totally empty, even though the adapter is running and working.
For those who want to jump in blindly:
Locate and then delete the following registry subkey:
For those who want to know a little more; read the article here - Windows 7 - Change Adapter Settings is blank / empty